SCS Software announced that two of their titles, Euro Truck Simulator 2 and American Truck Simulator are already within the top 200 games with the largest workshops in Steam Workshop in only a few days. Euro Truck Simulator 2 already has 147 mods and American Truck Simulator boast 97 mods. Some of these mods have been downloaded over 10,000 times.
Both of the titles are currently in open beta on Stea, with the full versions of the actual game being available for purchase. ETS2 will run you $22.99 and ATS with run $19.99. You can read the announcement from SCS here.
SCS Software is an independent developer known for developer Euro Truck Simulator in 2008. You can find out more on the developer here.